Roll device

ABSTRACT

A roll, for rolling metals or for grinding, comprises (1) a roll ring formed of a metal carbide, on (2) a metallic holder or support means, which latter means consists essentially in a flanged sleeve, on which the roll ring is disposed, with one side face of the same abutting against a peripheral part of the flange of the sleeve, and a co-operating flanged muff threaded onto the sleeve and having a peripheral part abutting against the other side face of the roll ring. Said flanges are so profiled as to leave annular slits on either side of the roll ring, in which slits there is provided a suitable adhesive substance &#39;&#39;&#39;&#39;glueing&#39;&#39;&#39;&#39; the roll ring to the flanges of the support means.

United States Patent Edsmar 1 June 6, 1972 [54] ROLL DEVICE 1,912,069 5/1933 Doermann ..51/207 X 1,984,936 12/ 1 934 Larsson [72]mammc'Edsmarfluddmgesweden 1,990,927 2 1935 Beth [73] Assignee:Sandvikens Jernverks Aktiebolag, Sand- 2,342,159 2/1944 Moran ..29/ 125viken, Sweden FOREIGN PATENTS OR APPLICATIONS [22] Filed: Nov. 4, 1970319,200 9/1929 Great Britain ..29/125 [21] App1.No.: 87,008 599,50810/1925 France Related US. Application Data 1,815,812 6/1970 Germany..29/125 Primary ExaminerAlfred R. Guest Attorne v-Pierce, Scheffler &Parker [57] ABSTRACT A roll, for rolling metals or for grinding,comprises l) a roll ring fonned of a metal carbide, on (2) a metallicholder or support means, which latt 2 means consists essentially in aflanged sleeve, on which the roll ring is disposed, with one side faceof the same abutting against a peripheral part of the flange of thesleeve, and a co-operating flanged muff threaded onto the sleeve andhaving a peripheral part abutting against the other side face of theroll ring. Said flanges are so profiled as to leave annular slits oneither side of the roll ring, in which slits there is provided asuitable adhesive substance g1ueing" the roll ring to the flanges of thesupport means.

5 Claims, 3 Drawing Figures JUN smz 3,667,096 PATENTED SHEEI 10F aP'A'TENTEUJUH 6 I972 3. 667. 096 sum 2 or 3 INVENTOR AU/W 6599/7/90man/71?,

ium'romsxs ROLL DEVICE This application is a continuation ofapplication, Ser. No. 760,459 filed Sept. 18, 1968 which is nowabandoned.

The present invention relates in the first place to rolls for rolling ofmetals but also to rolls for other purposes, for instance grinding,crushing, etc., the .rolls being composed of one or more roll rings, onwhich the surface for working the material is situated, and a holderwhich carries the roll ring or rings, and which can be the roll shaftitself or can be an annular device mounted on the roll shaft.

The purpose of a compound or built-up roll of this sort is usually to beable to use different materials in the roll ring and the holder part,each being made of a material suitable for its function. In doing so, itis usual to make the roll ring or rings of sintered metal carbide andthe holder part of steel. Sintered carbide is very suitable for thecontact with the material to be worked, as it is hard and has a highwear resistance. Because sintered metal carbide is relatively brittle,it is highly desirable to, if possible, avoid tensile stresses in thematerial which for instance can be done by forming the roll ring, sothat the forces acting thereon do not act in such a direction that thetensile stresses are increased, or by pre-tensioning it so that itinitially is subjected to compressive stresses which more or lesscounterbalance the influence of such forces that raise the tensilestress.

In prior compound rolls the roll ring and its holder have often beenprovided with cooperating protrusions and recesses in order to involvethe roll ring in the rotation of the holder, for instance fixedconnections of the claw coupling type and wedge connection type. Thesemodes of coupling cause local tensile stresses in the roll ring, and,moreover, substantially increase the manufacturing cost.

The present invention relates to an improvement in the construction of acompound roll of the type above referred to, characterized by thefeature that the roll ring is fastened by means of an adhesive joint atat least one of the two annular holder parts between which it isattached. By making one or both of the co-operating holder partsthreaded it is possible to introduce axial compressive stresses in thering at the time of mounting the roll ring by tightening theco-operating threaded parts thereby counteracting axial tensile stresseswhich may arise during operation of the roll.

The invention will now be described with greater particularity withreference to the following specific disclosure and to the appendeddrawing, in which FIG. 1 shows a section, in the axial plane, of a rollconstructed according to the inventionj FIG. 2 illustrates the conceptof mounting the roll ring directly on the roll shaft; and

FIG. 3 shows how a plurality of roll rings may be secured together intoone composite roll ring.

The roll shown in FIG. 1 consists of a roll ring 10, which is mounted ona holder 11. The holder consists of a bushing sleeve 13, which at oneend has a fixed flange l4 and at its other end has a thread 15, on whichis threaded a separate flange in the form of a flange muff 12. The rollring clamped between the flanges l2 and 14, and its cylindrical insideis suitably shaped to precisely match the external cylindrical surfaceof the bushing sleeve 13, whereby the roll ring is held centered. Theholder is adapted to be mounted on a conventional roll shaft (indicated.at 16) and driven for instance by clamping or by a key and slotconnection with the shaft. The flanges may alternatively be mounteddirectly on the roll shaft which then substitutes the bushing sleeve 13.

The flanges 12 and 14 have at their inner sides adjacent the peripheryinwardly raised portions 17 and 18 which abut against the roll ring 10.In this way there are formed slitshaped spaces 19 and 20 between theroll ring and the flanges at the inside of the portions 17 and 18.

The compressive force arising between the flanges 12 and 14 and the rollring 10 provides not only the hereinabove mentioned axial pre-tensionbut also a certain frictional force which counteracts the turning of theroll ring on the holder.

This friction force is, however, not sufficient for ensuring that theroll ring positively rotates with the holder when rolling. As abovestated, driving means previously have been used in the form ofcooperating projections and recesses. According to the presentinvention, a sufficient fastening to ensure positive driving of the rollring is obtained by applying an adhesive between the roll ring 10 and atleast one of the flanges l2 and 14. The adhesive is applied in thespaces l9-and 20. In order to stabilize the construction adhesive cansuitably be applied also on the thread 15.

In FIG. 2 another embodiment of the invention is shown, where the rollring 10 is mounted directly on the roll shaft 26. The roll ring is as inFIG. 1 embraced by two flanges, one of which 27 is integral with theshaft, the other 28 forming a separate sleeveon the shaft and clamped bya ring 29 and screws 30. Also in this embodiment the flanges have raisedportions 31, 32 on the surfaces that face the ring, so that slits 33, 34are fonned, but in this case the slits are situated peripherically. Thishas the advantage that in case the carbide ring breaks duringrolling,the adhesive in the slits will aid in preventing the pieces from flyingabout.

FIG. 3 illustrates how a number of roll rings 40, 41,42 and 43 can beclamped together between two flanges 44 and 45. As earlier describedthere are raised portions 46 and 47 on the flanges and correspondingslits 48 and 49. Between the rings there are shims 50 forming slits 51for an adhesive.

Instead of the illustrated annular raised'portions on the.

flange surfaces facing the roll rings there may be an arbitrary patternof raised portions, for instance radial, forming a cor respondingpattern of slits for the adhesive. Instead of having the raised portionson the flanges it is possible to have them on the roll rings, but thisis in general more inconvenient, as the carbide in the ring is moredifficult to shape.

Instead of having raised portions integral with the flange or the rollring the desired slit between a flange and a roll ring may be obtainedby separate distance pieces as shownat 50 between the rings in FIG. 3.In this case the facing annular surfaces on the ring and the flange areboth plane, and a distance piece in the form of an annular plate orthread is inserted between the surfaces. It has been found suitable touse a thread of tungsten or molybdenum between the annular surfaces,because said materials are not easily deformed by the clamping forces.

The described roller is intended for cold or hot rolling of wire orrods. In order to prevent the destruction of the adhesive joint by theheat in hot rolling, it is essential that the rolls are cooled duringthe rolling, so that the temperature is held relatively low, andpreferably does not exceed C. The cooling is important also in order toprevent the sintered carbide ring from bursting because steel has ahigher coefficient of thermal expansion than does sintered carbide. Inthe illustrated case, the roll ring 10 is mounted with accurate fit onthe bushing sleeve 13, which in turn is mounted on a common homogeneoussteel shaft. By strong heating of the whole structure the roll ringmight burst.

For bonding the rolling ring to the holder means there is used a type ofadhesive which is suitable for joining together the actual materials.For bonding sintered metal carbide to steel there can be used organicadhesives such as hardenable plastics (e.g., phenolic resin glue, epoxyresin glue and glue having an isocyanate base; also, as well, there canbe used mixtures such as epoxy-silicon glue or epoxy phenyl glue), ortherrnoplastics (e.g. vinyl resin), or elastomers (e.g. chloroprene,nitrile rubber), or mixtures of two types of glue such as hardenableplastic and thermoplastic (e.g. phenolvinyl resin) or hardenable plasticand elastomer (e.g. phenolnitrile rubber). Also inorganic glues can beused, as for instance silicate glue (waterglass-asbestos). Moreovermixtures of organic and inorganic glues can be used, as oxide of leadand polyvalent alcohols. In connection with the illustrated specificexample, an adhesive containing in the main a hardenable epoxy resin hasbeen found particularly suitable. It is cured at l00"200 C. and retainsits strength excellently at up to 150 C and to some extent at 200-250 C.Both heathardenable and cold-hardenable types of adhesive may be used.

The thickness of the adhesive joint should be 0.01-0.25 mm, the lowerlimit being in the illustrated embodiment suitably 0.05 mm, while theupper limit can be 0.20 mm, preferably 0.10 mm. In the illustrated casethe thickness of the joint is equal to the thickness of the slits 19 and20.

1 claim:

1. Roll for rolling, grinding, crushing and the like which comprises aroll ring holder having two spaced flanges;

a roll ring between the two flanges on the roll ring holder,

the roll ring and the flanges having matching contact surfaces in themain shaped as surfaces of revolution directed transversely to the axisof rotation of the roll; means for clamping the roll ring between theflanges;

at least one of said contact surfaces having (a) raised portions whichabut against the cooperating contact surface and (b) depressed portionswhich are somewhat spaced from the cooperating contact surface forming athin slit therewith, and

binder material in said slit,

the roll ring thus being torsionally fixed between the flanges of theroll ring holder solely by the clamping contact between the surface ofrevolution and the adhesion of the binder material.

2. Roll for rolling, grinding, crushing and the like which comprises aroll ring holder having two spaced flanges;

a roll ring clamped between the two flanges on the roll ring holder, theroll ring and the flanges having matching contact surfaces shaped assurfaces of revolution directed transversely to the axis of rotation ofthe roll; means for clamping the roll n'ng between the flanges; at leastone intermediate spacing member disposed between said congruent contactsurfaces and forming between the latter a thin slit; and binder materialin said slit, the roll ring being thus torsionally fixed between saidflanges of the roll ring holder by the combined action of the clampingmeans and of the binder material, the torsional fixation being obtainedexclusively by the clamping contact between the surfaces of revolutionand the adhesion of the binder. 3. Roll as defined in claim 1, in whichthe holder device at the same time forms part of the roll shafi of theroll.

4. Roll as defined in claim 1, in which at least one of the flanges,between which the roll ring is mounted, has that annular surface thereofwhich faces the roll ring formed with a peripherically situated annularsurface portion, which surface portion is somewhat raised in the axialdirection over the annular surface portion that is situated closer tothe-center, so that the peripherically situated surface portion abutsagainst the roll ring, while the surface portionthat is situated closerto the center is separated from the roll ring by a slit, which slitcontains an adhesive.

5. Roll as defined in claim 1, in which the thickness of the gluejointis 0.01-0.25 mm.

2. Roll for rolling, grinding, crushing and the like which comprises aroll ring holder having two spaced flanges; a roll ring clamped betweenthe two flanges on the roll ring holder, the roll ring and the flangeshaving matching contact surfaces shaped as surfaces of revolutiondirected transversely to the axis of rotation of the roll; means forclamping the roll ring between the flanges; at least one intermediatespacing member disposed between said congruent contact surfaces andforming between the latter a thin slit; and binder material in saidslit, the roll ring being thus torsionally fixed between said flanges ofthe roll ring holder by the combined action of the clamping means and ofthe binder material, the torsional fixation being obtained exclusivelyby the clamping contact between the surfaces of revolution and theadhesion of the binder.
 3. Roll as defined in claim 1, in which theholder device at the same time forms part of the roll shaft of the roll.4. Roll as defined in claim 1, in which at least one of the flanges,between which the roll ring is mounted, has that annular surface thereofwhich faces the roll ring formed with a peripherically situated annularsurface portion, which surface portion is somewhat raised in the axialdirection over the annular surface portion that is situated closer tothe center, so that the peripherically situated surface portion abutsagainst the roll ring, while the surface portion that is situated closerto the center is separated from the roll ring by a slit, which slitcontains an adhesive.
 5. Roll as defined in claim 1, in which thethickness of the glue joint is 0.01-0.25 mm.